C++ Thread::GetProcess方法代码示例

ThreadPlanAssemblyTracer::ThreadPlanAssemblyTracer (Thread &thread, lldb::StreamSP &stream_sp) :
    ThreadPlanTracer (thread, stream_sp),
    m_process(thread.GetProcess()),
    m_target(thread.GetProcess().GetTarget())
{
    InitializeTracer ();
}

bool
ABIMacOSX_i386::GetArgumentValues (Thread &thread,
                                   ValueList &values) const
{
    unsigned int num_values = values.GetSize();
    unsigned int value_index;

    // Get the pointer to the first stack argument so we have a place to start
    // when reading data

    RegisterContext *reg_ctx = thread.GetRegisterContext().get();

    if (!reg_ctx)
        return false;

    addr_t sp = reg_ctx->GetSP(0);

    if (!sp)
        return false;

    addr_t current_stack_argument = sp + 4; // jump over return address

    for (value_index = 0;
            value_index < num_values;
            ++value_index)
    {
        Value *value = values.GetValueAtIndex(value_index);

        if (!value)
            return false;

        // We currently only support extracting values with Clang QualTypes.
        // Do we care about others?
        CompilerType compiler_type (value->GetCompilerType());
        if (compiler_type)
        {
            bool is_signed;

            if (compiler_type.IsIntegerType (is_signed))
            {
                ReadIntegerArgument(value->GetScalar(),
                                    compiler_type.GetBitSize(&thread),
                                    is_signed,
                                    thread.GetProcess().get(),
                                    current_stack_argument);
            }
            else if (compiler_type.IsPointerType())
            {
                ReadIntegerArgument(value->GetScalar(),
                                    compiler_type.GetBitSize(&thread),
                                    false,
                                    thread.GetProcess().get(),
                                    current_stack_argument);
            }
        }
    }

    return true;
}

ThreadPlanCallFunction::ThreadPlanCallFunction (Thread &thread,
                                                Address &function,
                                                ValueList &args,
                                                bool stop_other_threads,
                                                bool discard_on_error) :
    ThreadPlan (ThreadPlan::eKindCallFunction, "Call function plan", thread, eVoteNoOpinion, eVoteNoOpinion),
    m_valid (false),
    m_stop_other_threads (stop_other_threads),
    m_arg_addr (0),
    m_args (&args),
    m_process (thread.GetProcess()),
    m_thread (thread)
{
    
    SetOkayToDiscard (discard_on_error);
    
    Process& process = thread.GetProcess();
    Target& target = process.GetTarget();
    const ABI *abi = process.GetABI();
    
    if(!abi)
        return;
    
    lldb::addr_t spBelowRedZone = thread.GetRegisterContext()->GetSP() - abi->GetRedZoneSize();
    
    SymbolContextList contexts;
    SymbolContext context;
    ModuleSP executableModuleSP (target.GetExecutableModule());
    
    if (!executableModuleSP ||
        !executableModuleSP->FindSymbolsWithNameAndType(ConstString ("start"), eSymbolTypeCode, contexts))
        return;
    
    contexts.GetContextAtIndex(0, context);
    
    m_start_addr = context.symbol->GetValue();
    lldb::addr_t StartLoadAddr = m_start_addr.GetLoadAddress(&process);
    
    if(!thread.SaveFrameZeroState(m_register_backup))
        return;
    
    m_function_addr = function;
    lldb::addr_t FunctionLoadAddr = m_function_addr.GetLoadAddress(&process);
    
    if (!abi->PrepareNormalCall(thread, 
                                spBelowRedZone, 
                                FunctionLoadAddr, 
                                StartLoadAddr, 
                                *m_args))
        return;
    
    m_valid = true;    
}

bool
ABISysV_i386::GetArgumentValues (Thread &thread,
                                   ValueList &values) const
{
    unsigned int num_values = values.GetSize();
    unsigned int value_index;

    RegisterContext *reg_ctx = thread.GetRegisterContext().get();

    if (!reg_ctx)
        return false;

    // Get pointer to the first stack argument
    addr_t sp = reg_ctx->GetSP(0);
    if (!sp)
        return false;

    addr_t current_stack_argument = sp + 4; // jump over return address

    for (value_index = 0;
         value_index < num_values;
         ++value_index)
    {
        Value *value = values.GetValueAtIndex(value_index);

        if (!value)
            return false;

        // Currently: Support for extracting values with Clang QualTypes only.
        CompilerType clang_type (value->GetCompilerType());
        if (clang_type)
        {
            bool is_signed;
            if (clang_type.IsIntegerType (is_signed))
            {
                ReadIntegerArgument(value->GetScalar(),
                                    clang_type.GetBitSize(&thread),
                                    is_signed,
                                    thread.GetProcess().get(),
                                    current_stack_argument);
            }
            else if (clang_type.IsPointerType())
            {
                ReadIntegerArgument(value->GetScalar(),
                                    clang_type.GetBitSize(&thread),
                                    false,
                                    thread.GetProcess().get(),
                                    current_stack_argument);
            }
        }
    }
    return true;
}

static bool ReadIntegerArgument(Scalar &scalar, unsigned int bit_width,
                                bool is_signed, Thread &thread,
                                uint32_t *argument_register_ids,
                                unsigned int &current_argument_register,
                                addr_t &current_stack_argument) {
  if (bit_width > 64)
    return false; // Scalar can't hold large integer arguments

  if (current_argument_register < 6) {
    scalar = thread.GetRegisterContext()->ReadRegisterAsUnsigned(
        argument_register_ids[current_argument_register], 0);
    current_argument_register++;
    if (is_signed)
      scalar.SignExtend(bit_width);
  } else {
    uint32_t byte_size = (bit_width + (8 - 1)) / 8;
    Status error;
    if (thread.GetProcess()->ReadScalarIntegerFromMemory(
            current_stack_argument, byte_size, is_signed, scalar, error)) {
      current_stack_argument += byte_size;
      return true;
    }
    return false;
  }
  return true;
}

ThreadPlanSP
DynamicLoaderPOSIXDYLD::GetStepThroughTrampolinePlan(Thread &thread, bool stop)
{
    LogSP log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER));
    ThreadPlanSP thread_plan_sp;

    StackFrame *frame = thread.GetStackFrameAtIndex(0).get();
    const SymbolContext &context = frame->GetSymbolContext(eSymbolContextSymbol);
    Symbol *sym = context.symbol;

    if (sym == NULL || !sym->IsTrampoline())
        return thread_plan_sp;

    const ConstString &sym_name = sym->GetMangled().GetName(Mangled::ePreferMangled);
    if (!sym_name)
        return thread_plan_sp;

    SymbolContextList target_symbols;
    Target &target = thread.GetProcess().GetTarget();
    ModuleList &images = target.GetImages();

    images.FindSymbolsWithNameAndType(sym_name, eSymbolTypeCode, target_symbols);
    size_t num_targets = target_symbols.GetSize();
    if (!num_targets)
        return thread_plan_sp;

    typedef std::vector<lldb::addr_t> AddressVector;
    AddressVector addrs;
    for (size_t i = 0; i < num_targets; ++i)
    {
        SymbolContext context;
        AddressRange range;
        if (target_symbols.GetContextAtIndex(i, context))
        {
            context.GetAddressRange(eSymbolContextEverything, 0, false, range);
            lldb::addr_t addr = range.GetBaseAddress().GetLoadAddress(&target);
            if (addr != LLDB_INVALID_ADDRESS)
                addrs.push_back(addr);
        }
    }

    if (addrs.size() > 0) 
    {
        AddressVector::iterator start = addrs.begin();
        AddressVector::iterator end = addrs.end();

        std::sort(start, end);
        addrs.erase(std::unique(start, end), end);
        thread_plan_sp.reset(new ThreadPlanRunToAddress(thread, addrs, stop));
    }

    return thread_plan_sp;
}

ThreadPlanRunToAddress::ThreadPlanRunToAddress(
    Thread &thread, const std::vector<lldb::addr_t> &addresses,
    bool stop_others)
    : ThreadPlan(ThreadPlan::eKindRunToAddress, "Run to address plan", thread,
                 eVoteNoOpinion, eVoteNoOpinion),
      m_stop_others(stop_others), m_addresses(addresses), m_break_ids() {
  // Convert all addresses into opcode addresses to make sure we set
  // breakpoints at the correct address.
  Target &target = thread.GetProcess()->GetTarget();
  std::vector<lldb::addr_t>::iterator pos, end = m_addresses.end();
  for (pos = m_addresses.begin(); pos != end; ++pos)
    *pos = target.GetOpcodeLoadAddress(*pos);

  SetInitialBreakpoints();
}

bool UnwindAssemblyInstEmulation::GetNonCallSiteUnwindPlanFromAssembly(
    AddressRange &range, Thread &thread, UnwindPlan &unwind_plan) {
  std::vector<uint8_t> function_text(range.GetByteSize());
  ProcessSP process_sp(thread.GetProcess());
  if (process_sp) {
    Error error;
    const bool prefer_file_cache = true;
    if (process_sp->GetTarget().ReadMemory(
            range.GetBaseAddress(), prefer_file_cache, function_text.data(),
            range.GetByteSize(), error) != range.GetByteSize()) {
      return false;
    }
  }
  return GetNonCallSiteUnwindPlanFromAssembly(
      range, function_text.data(), function_text.size(), unwind_plan);
}

static bool
GetReturnValuePassedInMemory(Thread &thread, RegisterContext* reg_ctx, size_t byte_size, Value& value)
{
    Error error;
    DataBufferHeap buffer(byte_size, 0);

    const RegisterInfo *r0_reg_info = reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG1);
    uint32_t address = reg_ctx->ReadRegisterAsUnsigned(r0_reg_info, 0) & UINT32_MAX;
    thread.GetProcess()->ReadMemory(address, buffer.GetBytes(), buffer.GetByteSize(), error);

    if (error.Fail())
        return false;

    value.SetBytes(buffer.GetBytes(), buffer.GetByteSize());
    return true;
}

UnwindLLDB::UnwindLLDB (Thread &thread) :
    Unwind (thread),
    m_frames(),
    m_unwind_complete(false),
    m_user_supplied_trap_handler_functions()
{
    ProcessSP process_sp(thread.GetProcess());
    if (process_sp)
    {
        Args args;
        process_sp->GetTarget().GetUserSpecifiedTrapHandlerNames (args);
        size_t count = args.GetArgumentCount();
        for (size_t i = 0; i < count; i++)
        {
            const char *func_name = args.GetArgumentAtIndex(i);
            m_user_supplied_trap_handler_functions.push_back (ConstString (func_name));
        }
    }
}

bool UnwindAssembly_x86::GetNonCallSiteUnwindPlanFromAssembly(
    AddressRange &func, Thread &thread, UnwindPlan &unwind_plan) {
  if (!func.GetBaseAddress().IsValid() || func.GetByteSize() == 0)
    return false;
  if (m_assembly_inspection_engine == nullptr)
    return false;
  ProcessSP process_sp(thread.GetProcess());
  if (process_sp.get() == nullptr)
    return false;
  const bool prefer_file_cache = true;
  std::vector<uint8_t> function_text(func.GetByteSize());
  Status error;
  if (process_sp->GetTarget().ReadMemory(
          func.GetBaseAddress(), prefer_file_cache, function_text.data(),
          func.GetByteSize(), error) == func.GetByteSize()) {
    RegisterContextSP reg_ctx(thread.GetRegisterContext());
    m_assembly_inspection_engine->Initialize(reg_ctx);
    return m_assembly_inspection_engine->GetNonCallSiteUnwindPlanFromAssembly(
        function_text.data(), func.GetByteSize(), func, unwind_plan);
  }
  return false;
}

bool UnwindAssembly_x86::GetFastUnwindPlan(AddressRange &func, Thread &thread,
                                           UnwindPlan &unwind_plan) {
  // if prologue is
  //   55     pushl %ebp
  //   89 e5  movl %esp, %ebp
  //  or
  //   55        pushq %rbp
  //   48 89 e5  movq %rsp, %rbp

  // We should pull in the ABI architecture default unwind plan and return that

  llvm::SmallVector<uint8_t, 4> opcode_data;

  ProcessSP process_sp = thread.GetProcess();
  if (process_sp) {
    Target &target(process_sp->GetTarget());
    const bool prefer_file_cache = true;
    Status error;
    if (target.ReadMemory(func.GetBaseAddress(), prefer_file_cache,
                          opcode_data.data(), 4, error) == 4) {
      uint8_t i386_push_mov[] = {0x55, 0x89, 0xe5};
      uint8_t x86_64_push_mov[] = {0x55, 0x48, 0x89, 0xe5};

      if (memcmp(opcode_data.data(), i386_push_mov, sizeof(i386_push_mov)) ==
              0 ||
          memcmp(opcode_data.data(), x86_64_push_mov,
                 sizeof(x86_64_push_mov)) == 0) {
        ABISP abi_sp = process_sp->GetABI();
        if (abi_sp) {
          return abi_sp->CreateDefaultUnwindPlan(unwind_plan);
        }
      }
    }
  }
  return false;
}

bool
ABISysV_hexagon::PrepareTrivialCall ( Thread &thread, 
                                      lldb::addr_t  sp  , 
                                      lldb::addr_t  pc  , 
                                      lldb::addr_t  ra  , 
                                      llvm::Type   &prototype,
                                      llvm::ArrayRef<ABI::CallArgument> args) const
{
    // default number of register passed arguments for varg functions
    const int nVArgRegParams = 1;
    Error error;

    // grab the process so we have access to the memory for spilling
    lldb::ProcessSP proc = thread.GetProcess( );

    // push host data onto target
    for ( size_t i = 0; i < args.size( ); i++ )
    {
        const ABI::CallArgument &arg = args[i];
        // skip over target values
        if ( arg.type == ABI::CallArgument::TargetValue )
            continue;
        // round up to 8 byte multiple
        size_t argSize = ( arg.size | 0x7 ) + 1;

        // create space on the stack for this data
        sp -= argSize;

        // write this argument onto the stack of the host process
        proc.get( )->WriteMemory( sp, arg.data, arg.size, error );
        if ( error.Fail( ) )
            return false;

        // update the argument with the target pointer
        //XXX: This is a gross hack for getting around the const
        *((size_t*)(&arg.value)) = sp;
    }


#if HEX_ABI_DEBUG
    // print the original stack pointer
    printf( "sp : %04lx \n", sp );
#endif

    // make sure number of parameters matches prototype
    assert( prototype.getFunctionNumParams( ) == args.size( ) );

    // check if this is a variable argument function
    bool isVArg = prototype.isFunctionVarArg();

    // get the register context for modifying all of the registers
    RegisterContext *reg_ctx = thread.GetRegisterContext().get();
    if (!reg_ctx)
        return false;
    
    // number of arguments passed by register
    int nRegArgs = nVArgRegParams;
    if (! isVArg )
    {
        // number of arguments is limited by [R0 : R5] space
        nRegArgs = args.size( );
        if ( nRegArgs > 6 )
            nRegArgs = 6;
    }

    // pass arguments that are passed via registers
    for ( int i = 0; i < nRegArgs; i++ )
    {
        // get the parameter as a u32
        uint32_t param = (uint32_t)args[i].value;
        // write argument into register
        if (!reg_ctx->WriteRegisterFromUnsigned( i, param ))
            return false;
    }

    // number of arguments to spill onto stack
    int nSpillArgs = args.size( ) - nRegArgs;
    // make space on the stack for arguments
    sp -= 4 * nSpillArgs;
    // align stack on an 8 byte boundary
    if ( sp & 7 )
        sp -= 4;

    // arguments that are passed on the stack
    for ( size_t i = nRegArgs, offs=0; i < args.size( ); i++ )
    {
        // get the parameter as a u32
        uint32_t param = (uint32_t)args[i].value;
        // write argument to stack
        proc->WriteMemory( sp + offs, (void*)&param, sizeof( param ), error );
        if ( !error.Success( ) )
            return false;
        // 
        offs += 4;
    }

    // update registers with current function call state
    reg_ctx->WriteRegisterFromUnsigned ( 41, pc );
    reg_ctx->WriteRegisterFromUnsigned ( 31, ra );
    reg_ctx->WriteRegisterFromUnsigned ( 29, sp );
//.........这里部分代码省略.........

//.........这里部分代码省略.........
     
        // The the instruction emulation subclass setup the unwind plan for the
        // first instruction.
        m_inst_emulator_ap->CreateFunctionEntryUnwind (unwind_plan);

        // CreateFunctionEntryUnwind should have created the first row. If it
        // doesn't, then we are done.
        if (unwind_plan.GetRowCount() == 0)
            return false;
        
        ExecutionContext exe_ctx;
        thread.CalculateExecutionContext(exe_ctx);
        DisassemblerSP disasm_sp (Disassembler::DisassembleRange (m_arch,
                                                                  NULL,
                                                                  exe_ctx,
                                                                  range));
        
        LogSP log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND));

        if (disasm_sp)
        {
            
            m_range_ptr = ⦥
            m_thread_ptr = &thread;
            m_unwind_plan_ptr = &unwind_plan;

            const uint32_t addr_byte_size = m_arch.GetAddressByteSize();
            const bool show_address = true;
            const bool show_bytes = true;
            const bool raw = false;
            // Initialize the CFA with a known value. In the 32 bit case
            // it will be 0x80000000, and in the 64 bit case 0x8000000000000000.
            // We use the address byte size to be safe for any future addresss sizes
            m_inst_emulator_ap->GetRegisterInfo (unwind_plan.GetRegisterKind(), 
                                                 unwind_plan.GetInitialCFARegister(), 
                                                 m_cfa_reg_info);
            
            m_fp_is_cfa = false;
            m_register_values.clear();
            m_pushed_regs.clear();

            m_initial_sp = (1ull << ((addr_byte_size * 8) - 1));
            RegisterValue cfa_reg_value;
            cfa_reg_value.SetUInt (m_initial_sp, m_cfa_reg_info.byte_size);
            SetRegisterValue (m_cfa_reg_info, cfa_reg_value);
                
            const InstructionList &inst_list = disasm_sp->GetInstructionList ();
            const size_t num_instructions = inst_list.GetSize();
            if (num_instructions > 0)
            {
                Instruction *inst = inst_list.GetInstructionAtIndex (0).get();
                const addr_t base_addr = inst->GetAddress().GetFileAddress();
                // Initialize the current row with the one row that was created
                // from the CreateFunctionEntryUnwind call above...
                m_curr_row = unwind_plan.GetLastRow();

                for (size_t idx=0; idx<num_instructions; ++idx)
                {
                    inst = inst_list.GetInstructionAtIndex (idx).get();
                    if (inst)
                    {

                        if (log && log->GetVerbose ())
                        {
                            StreamString strm;
                            inst->Dump(&strm, inst_list.GetMaxOpcocdeByteSize (), show_address, show_bytes, &exe_ctx, raw);
                            log->PutCString (strm.GetData());
                        }

                        m_inst_emulator_ap->SetInstruction (inst->GetOpcode(), 
                                                            inst->GetAddress(), 
                                                            exe_ctx.GetTargetPtr());

                        m_inst_emulator_ap->EvaluateInstruction (eEmulateInstructionOptionIgnoreConditions);
                        
                        if (unwind_plan.GetLastRow() != m_curr_row)
                        {
                            // Be sure to not edit the offset unless our row has changed
                            // so that the "!=" call above doesn't trigger every time
                            m_curr_row.SetOffset (inst->GetAddress().GetFileAddress() + inst->GetOpcode().GetByteSize() - base_addr);
                            // Append the new row
                            unwind_plan.AppendRow (m_curr_row);
                        }
                    }
                }
            }
        }
        
        if (log && log->GetVerbose ())
        {
            StreamString strm;
            lldb::addr_t base_addr = range.GetBaseAddress().GetLoadAddress(&thread.GetProcess().GetTarget());
            strm.Printf ("Resulting unwind rows for [0x%llx - 0x%llx):", base_addr, base_addr + range.GetByteSize());
            unwind_plan.Dump(strm, &thread, base_addr);
            log->PutCString (strm.GetData());
        }
        return unwind_plan.GetRowCount() > 0;
    }
    return false;
}

//.........这里部分代码省略.........
                lldb::addr_t storage_addr = (uint32_t)(thread.GetRegisterContext()->ReadRegisterAsUnsigned(eax_id, 0) & 0xffffffff);
                return_valobj_sp = ValueObjectMemory::Create (&thread,
                                                               "",
                                                              Address (storage_addr, nullptr),
                                                              return_clang_type);
            }
        }

        else  // Neither 'Integral' nor 'Floating Point'
        {
            // If flow reaches here then check type_flags
            // This type_flags is unhandled
        }
    }

    else if (type_flags & eTypeIsComplex)    // 'Complex Floating Point'
    {
       // ToDo: Yet to be implemented
    }

    else if (type_flags & eTypeIsVector)    // 'Packed'
    {
        const size_t byte_size = return_clang_type.GetByteSize(nullptr);
        if (byte_size > 0)
        {
            const RegisterInfo *vec_reg = reg_ctx->GetRegisterInfoByName("xmm0", 0);
            if (vec_reg == nullptr)
                vec_reg = reg_ctx->GetRegisterInfoByName("mm0", 0);

            if (vec_reg)
            {
                if (byte_size <= vec_reg->byte_size)
                {
                    ProcessSP process_sp (thread.GetProcess());
                    if (process_sp)
                    {
                        std::unique_ptr<DataBufferHeap> heap_data_ap (new DataBufferHeap(byte_size, 0));
                        const ByteOrder byte_order = process_sp->GetByteOrder();
                        RegisterValue reg_value;
                        if (reg_ctx->ReadRegister(vec_reg, reg_value))
                        {
                            Error error;
                            if (reg_value.GetAsMemoryData (vec_reg,
                                                           heap_data_ap->GetBytes(),
                                                           heap_data_ap->GetByteSize(),
                                                           byte_order,
                                                           error))
                            {
                                DataExtractor data (DataBufferSP (heap_data_ap.release()),
                                                    byte_order,
                                                    process_sp->GetTarget().GetArchitecture().GetAddressByteSize());
                                return_valobj_sp = ValueObjectConstResult::Create (&thread,
                                                                                   return_clang_type,
                                                                                   ConstString(""),
                                                                                   data);
                            }
                        }
                    }
                }
                else if (byte_size <= vec_reg->byte_size*2)
                {
                    const RegisterInfo *vec_reg2 = reg_ctx->GetRegisterInfoByName("xmm1", 0);
                    if (vec_reg2)
                    {
                        ProcessSP process_sp (thread.GetProcess());
                        if (process_sp)